Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cef768c752f1d7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 16:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fbbde273dd4f4c18582ea2530d67aab SHA-1: c9e6e988040b3aec9994e3d56f83325a1d675aec SHA-256: e7cef768c752f1d70f920cbb80850e54d1d1063b656e009bf9e8c38221ad17d4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The document body, though heavily obfuscated, suggests it may be a lure, possibly related to QR codes or Wi-Fi, intended to direct the user to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wakesup.org/userfiles/file/8018598975.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346ee8da3db---55339435618.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/94459157320.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/murulogaraj.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/farolejolojepavomipotat.pdfIn PDF document text
    • http://azizolace.cz/images/file/kejadufe.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/wufagewozufebamez.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/lugozapezamekawiwupaguvo.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/boberefeferusikotemu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfd1b2032---98719453923.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/12257224267.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/sumizijujejipogetoleru.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/93769860231.pdfIn PDF document text
    • http://creationart.hu/files/file/gabujabogituvuvekuvuwaleg.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b6d94a88880968b22396f42145e2d4c3/makepiteji.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/66215354494.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/48270775560.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/vasovugutofumarebugun.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/wubomiwum.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/85141931114.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/62459255486.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/8245548070.pdfIn PDF document text
    • https://duvanco.be/docs/files/kaliberodaxuwumubif.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109091020452221.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/65269752751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wifi+qr+code+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 17652 bytes
SHA-256: fed1d122f5e0ac708f6cb59c0477bc6947af9d6220b68b74eb18c1724c13e454
font_02_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 10296 bytes
SHA-256: f921946f32f0c1e75f2b3e2b2a2715b1b5904555a81ce1629fc35fb7ac596215

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